import { spawn, type ChildProcess } from 'child_process';
import waitOn from 'wait-on';
import debug from 'debug';
const dbg = debug('test-card:utils');

const SERVER_PORT = 5888;

let devServer: ChildProcess;
export async function startDevServer(): Promise<void> {
	return new Promise((resolve, reject) => {
		dbg('Starting dev server on http://localhost:%d...', SERVER_PORT);
		devServer = spawn(
			'npm',
			['run', 'dev', '--', '--host', 'localhost', '--port', String(SERVER_PORT)],
			{
				stdio: 'pipe',
				shell: true
			}
		);

		// Wait until SvelteKit dev server responds
		waitOn(
			{
				resources: [`http://localhost:${SERVER_PORT}`],
				timeout: 30000
			},
			(err) => {
				if (err) reject(err);
				else resolve();
			}
		);

		dbg('Dev server started');
	});
}

export async function stopDevServer(): Promise<void> {
	if (devServer) {
		dbg('Stopping dev server...');
		devServer.kill('SIGTERM');
	}
}